Document Detail


Stream ecosystem response to chronic deposition of N and acid at the Bear Brook Watershed, Maine.
MedLine Citation:
PMID:  20535547     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
The Bear Brook Watershed in Maine (BBWM) is a long-term, paired watershed experiment that addresses the effects of acid and nitrogen (N) deposition on whole watersheds. To examine stream response at BBWM, we synthesized data on organic matter dynamics, including leaf breakdown rates, organic matter inputs and standing stocks, macroinvertebrate secondary production, and nutrient uptake in treated and reference streams at the BBWM. While N concentrations in stream water and leaves have increased, the input, standing stocks, and breakdown rates of leaves, as well as macroinvertebrate production, were not responsive to acid and N deposition. Both chronic and acute increases of N availability have saturated uptake of nitrate in the streams. Recent experimental increases in phosphorus (P) availability enhanced stream capacity to take up nitrate and altered the character of N saturation. These results show how the interactive effects of multiple factors, including environmental flow regime, acidification, and P availability, may constrain stream response to chronic N deposition.
Authors:
Kevin S Simon; Michael A Chadwick; Alexander D Huryn; H Maurice Valett
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-06-10
Journal Detail:
Title:  Environmental monitoring and assessment     Volume:  171     ISSN:  1573-2959     ISO Abbreviation:  Environ Monit Assess     Publication Date:  2010 Dec 
Date Detail:
Created Date:  2010-10-28     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8508350     Medline TA:  Environ Monit Assess     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  83-92     Citation Subset:  IM    
Affiliation:
School of Biology and Ecology, University of Maine, Orono, ME 04473-5722, USA. ksimon@maine.edu
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